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04-components.html
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04-components.html
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<!doctype html>
<title>04 Components - React From Zero</title>
<script src="https://unpkg.com/[email protected]/dist/react.js"></script>
<script src="https://unpkg.com/[email protected]/dist/react-dom.js"></script>
<script src="https://unpkg.com/[email protected]/browser.min.js"></script>
<div id="app"></div>
<script type="text/babel">
// The main selling point of React is its component system
// components are used to encapsulate elements and their behaviour
// see them as a mix of controller and view of MVC
// Here we use stand alone elements and some data
var data = 'world'
var reactElement =
<div>
<h1>Hello</h1>
<h2>{data}</h2>
</div>
// Here the elements are encapsuled in a simple component function
// They have to start with a capital letter and
// return exactly ONE root element with or without nested elements
function MyComponent() {
var data = 'world'
return (
<div>
<h1>Hello</h1>
<h2>{data}</h2>
</div>
)
}
// a component function can be used like an element
reactElement = <MyComponent/>
// this translates to a React.createElement() call
// the null indicates that no properties have been set
reactElement = React.createElement(MyComponent, null)
// for reference a react-internal <div> tag
var anotherElement = <div/>
// gets converted to
anotherElement = React.createElement('div', null)
var renderTarget = document.getElementById('app')
ReactDOM.render(reactElement, renderTarget)
</script>